Senior Level Developer

Position Overview

The Senior‑Level Developer serves as a technical modernization leader responsible for designing, refactoring, and implementing AWS Cloud Native solutions as part of a large‑scale legacy system‑of‑systems migration initiative.

This role requires expert‑level proficiency in Python and deep expertise in AWS services and serverless architecture. The Senior‑Level Developer will actively participate in system discovery, contribute to development of a structured systems inventory, and support creation and execution of phased migration plans from legacy on‑premises platforms to cloud‑native environments.

This position is not limited to feature development; it requires ownership of complex refactoring efforts, architectural fidelity, and integration stability across interconnected modernization work streams.

• Participate in structured discovery sessions to assess legacy systems, data flows, and integration dependencies
• Contribute to development of a comprehensive systems inventory documenting:
  • Functional capabilities
  • Technical stack
  • Data dependencies
  • Upstream/downstream integration points
• Support development of a phased migration plan, including:
  • Refactor vs lift‑and‑shift analysis
  • Risk identification
  • Sequencing of interdependent systems
  • Hybrid mitigation strategies
• Collaborate with architects and Requirements Engineers to align modernization strategy with technical feasibility

• Lead complex refactor efforts from legacy environments (e.g., SAS, file‑based batch systems) to Python‑based AWS Cloud Native architectures
• Redesign algorithms and workflows for scalability and performance
• Ensure computational and functional equivalence during migration
• Replace file‑based ingestion models with API‑ and database‑driven architectures
• Optimize high‑volume, data‑intensive applications for distributed execution

Expert‑level Python proficiency is required
, including:

• Advanced data processing
• Modular architecture design
• Performance optimization
• Test‑driven development practices

• Design and implement solutions using AWS services such as:
  • Lambda
  • ECS / EKS
  • Fargate
  • Aurora/Postgres
  • Event Bridge
  • SNS/SQS
  • Glue
  • Batch
  • S3
  • IAM / KMS
• Architect event‑driven and serverless patterns
• Implement scalable containerized workloads
• Ensure alignment with enterprise cloud guardrails and security requirements
• Optimize cost, performance, and resilience within AWS environments

Expert‑level experience in AWS Cloud Native architectures and serverless technologies is required.

• Identify cross‑workstream integration risks
• Ensure upstream/downstream compatibility during phased modernization
• Support design of orchestration patterns to prevent sequencing errors and data thrashing
• Collaborate with other Senior Developers across work streams to coordinate shared services and integration layers
• Participate in architecture review discussions and technical governance forums

• Design CI/CD‑aware applications compatible with Git Lab or equivalent pipelines
• Integrate automated testing and security scanning into development lifecycle
• Troubleshoot pipeline failures and optimize build processes
• Ensure observability through structured logging, metrics, and monitoring
• Support infrastructure‑as‑code alignment (Terraform/Cloud Formation collaboration)

• Participate in Agile Scrum ceremonies
• Provide technical decomposition of EPICs into implementable features
• Mentor Mid‑Level Developers
• Assist Product Owner and Requirements Engineer in refining complex stories
• Contribute to Definition of Done including:
  • Code complete
  • Automated tests implemented
  • Security checks passed
  • Documentation updated

• 8+ years of software development experience
• Expert‑level proficiency in Python
• Demonstrated experience participating in development and execution of a systems inventory and migration plan from legacy on‑premise systems to AWS Cloud
• Expert‑level experience with AWS services and serverless architectures
• Experience refactoring…